Artificial noise (AN) can be added to the received signal by the transmitter or a jammer to degrade the signal-to-noise ratio (SNR) at the eavesdropper without affecting the SNR at the destination [1]}.
The legitimate user and the transmitter/jammer cooperate in the system, and thus the user can
cancel out the effect of jamming. Furthermore, cooperative jamming (CJ), where a relay node transmits a jamming signal to create interference at the eavesdropper, is another way to improve the secrecy performance [2]}.
The authors in [3]} derived the SOP of a joint relay and friendly jammer selection scheme from a set of multiple energy harvesting relays.
In [4]}, the authors considered optimal power allocation to cooperative jammers to maximize the secrecy rate and obtained the corresponding SOP performance .
